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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f2ea46e819d2aade2d4a27557a8872edfeabd01e04cdb968de07d19f7106d1' 
  AND token = 'OQyDiCIG05B9srnjjXH0kOeEuF6PHx4vU8v79hs/+iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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