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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892ff7038c66fc8231e2d69b526d3ee0d3fc45625a50cfcbf4e002a852ec7d5a' 
  AND token = 'rMwuchkmwqGU+F+Pgf6L5rQJ5+I+SAHeXpyRWFI6PY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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