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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28130507c2ed82c87911945732238bd9ac5d991e31c7017e1aabb576048352c0' 
  AND token = 'rnB9j+bBiRODFsk3vwQ3Tk17OVUNOb2vA19JDDlQZJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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