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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f948eedc4b17e5dd8812fb4161b442b47641a83b3d12243162bf2dbd2786198' 
  AND token = 'c1VQCrl4noACCcdAQHL7c9tilwDKeROCT9Fh/R/uoLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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