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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3111b01913f0d7a16b42594e946c8577abbc19d94943c8ae5bfcc117f1aeb3d0' 
  AND token = 'ASTY2oC1LjzS48U2Na5sTCQ3/oZZXjQfBmfPIxWrXu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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