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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ff2ba52414256a77385e3e5b925309e8d6f56bc5d4b519e75ab6678b3efe49' 
  AND token = 'o5PbapdjJqWNpab/8thsvG0w3ExmHo3ERSoTaj4lURk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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