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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a86ae14d5436a5be44d38da336ccd9814ef35d10d9ca820c6abb7dc31b06f1b' 
  AND token = 'LL5CHwSr9c/fDPIWGfT6gyb/ZdMT2WOyJLXWqRbfmPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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