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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272ad40a6b170cfba680a19dd6c2a8714d3edfe2d4257cf70a53b61d553efc46' 
  AND token = '7oz2O2NdNaviyOcv77z3rUgAUKsA0QIQagIxf7Mj8Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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