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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b10f46d4e89914a52fac4cc22cb72f82c287d694ec6bc1e19d65f80c5800ff2' 
  AND token = '4O1E2gIdxn/pPmePF2lTjvrlADTS2eI2JQM/eFUM4KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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