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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cb4eebe8f3a12d1190f7defdb437852acc6324b2cd5960208275d2799c1158' 
  AND token = 'bdLKmsYKAiNMkJS/P8BXp50pCUrIev+9kf/Td1hnWLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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