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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b58585b361d20defb56cdf2cd363fd66e66b3206886923dd6550e86b9592ee6' 
  AND token = '7Ty6IwrqXE6mApbn20g/sdHI6mL67tCwTWdtz0EjXxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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