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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eedb19aa29a6bec2c5afb3b58a197ebffb304116924ed2108f83b65445228ab' 
  AND token = 'kEALV4ibG1Shwx4m3HC70ZXNm9hvYN5gahDs9MjYdJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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