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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12032ba7f3e3b910b6afad8e167bc9b71f787dadb1f59e51e60b1eb200d67d72' 
  AND token = 'SCjdpQJanRfraLhNVRTqnlYAmVjSFczCBy9WiJ1/pYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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