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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0620812fe24c68cdfbbbd9691fe2d3d0eba046ebb4bd803e4da461a01af4865' 
  AND token = 'fTtH/HqLb6ObL3VZvjD78u11P1GlL0tzVDNgS9clOoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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