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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6e87e1cbd5256a0cd0000930da7687c86db379b3dd4a5a7a81812729430d56' 
  AND token = '1EjF6L2y4Q8pB9qvBZdu8ovICswTL6KxlCNOWoE10Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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