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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830e74e8e0f127471dc7585c48382ef1d4f856a4d87b10dd115a838f4026d7d4' 
  AND token = '7PvimloQ5E8/f8924l5/DP2VahGnAgnFcADIXjzQRSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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