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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3570d09ecf6ff79b87d3473ebb95b4171e3289d7f7a1b60e561a24769560f6c' 
  AND token = 'bl+RZao+8GrIRLe16R1+QO5c+IjEE66k79dZV7WrwUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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