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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc97f15b6d5a4d54ba18e608fe0985b1cdfded95f71ecaaf1da17375f76e8f6' 
  AND token = '5rmf7hqo0EQGPkxWnKe5NtxadE3Ye4vHk3otdL2AHb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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