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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e963d50db294817eb6e2066a50deaaed409b9ae890cb72c8cae0acd10d5d1f6b' 
  AND token = 'nPo2J4xw59wdNukqRFCUUyhN5yzXFdVV3as49hx3G7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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