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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58eda1c609ecbc3f43ad4dd6c5be0d30274509707844fe787706b8279bd77f2c' 
  AND token = 'YwToYmio2w1u7DWSZ1gZpIP4S19yBVTSt+DQrqd/9gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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