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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68d573ec93901c8c0661c3cb5cfd9432d91825c84bb9629adc0a602b5e9cc27' 
  AND token = 'eWokF9f5an9domgDtGOPnGj+kElW7uZNoWHbYnb3AoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}