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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c55d7cf246e7db6125fd967101a9b5159683add1cf4863ce3358472f85249be' 
  AND token = 'W93ZhPTNt7a+1j2X+Nhrk+p031cYegdDifQIOLfQoxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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