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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd6339f78df6909e9a47ca66833ace7ccbfc924040f802d8e6eec076a633e9c' 
  AND token = '7n+hwj4RwLBwzChGu9a5uH4WBEmfL8SwXOkqRR8ylNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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