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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e056639c3b3d8ff7e8a04ab57e89077624002d0229e45f8426a34233639486' 
  AND token = 'DfvmVmq94oraEO1PN27ReFw/ikC1eA/eNDGEEV9fmQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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