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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b87f2593d666a0d169a31a2d8d4174fa5cbb0cf9404303ac72ea2bb3c6e2d9' 
  AND token = 'hHJdVK+2I1Eu0qb8uvOVU4Y9zEOW3X9N24kRxN5s8gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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