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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6161b25a3aad9410e5aad064dc73c67cbfe64470751c1bb2f84d5ff917f6413c' 
  AND token = 'dy59nvBCNG1M7R71J+hRiZiwRkMI5qcH4DIFFdovHF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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