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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f692c3ab10ad9d190051fef3fdbaa3004318f77c9347e3ad81ac8dd87aad308' 
  AND token = '0vr8halnpc3aL5FPh6IUqIOcCKTYxjdt2c7cSawGoHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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