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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c47f0e4ce1b4d282a5bb28a53f8578722d1e1e877cadf4d4c8d96954effeed' 
  AND token = 'tCx14GWKYESC2/b73IcnMLGNSNO96mi/w9u5Cp2TCcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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