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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2df8df279978d8a73490d8f6c308d0b4fa755e58121167095450e96340b23dc' 
  AND token = 'HcMoaLAXT/hJcESrBOOYBZp27+6Ork/S2Pr3EeulKLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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