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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cd5d1cd2f7c5be79f3b97aa3295b9d0dd4fd2a7d4578eff77dcbd9e6127606' 
  AND token = '/eAUwoNacuuMFwh1WJP4vNwOqozEnqOCn37b/kdoXDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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