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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b2b01e96dd6970c1c9b09750f5314198881f39389eeb07076ee4996c98ca26' 
  AND token = 'L29qlKCcCk3+YsBWnXJm0x2fATSINq4nvGE1p7Du/jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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