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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b148566d143f9483a27629ce3b913ffff49de3ede35071a1ab7f8d19d58162' 
  AND token = '8vtY3+Qmd92Toof1VNjRBn2isfsS3YAcDDyLRMyh4t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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