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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d63802c882487e0f389d19ad3212bb6fe406c6811c29390ec3f1d24008a605' 
  AND token = 'OwxC2SUY6yKY3Q27sNNNdtUQIIwmmFeU4O+3I0T4IQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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