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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542d31314eaacafadcde19593f2b01f19c7cac489b7d1e0b3b39bd571b984d8a' 
  AND token = 'r/Wmb8OQlpV94/SSAXiySjTe8vwf7V9EOojRz3aXenQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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