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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d7655f16b21f271250908989f3506a0291433b02b6506ba9418074ba2090ef' 
  AND token = 'mEjXJuCJZPpEK11D+bZtLSyME2VCIC3z3OLydjapEao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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