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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edee4e0ec85de4d1eb3f092823b5917497133a54faf51b0f2ca5cbeab20cf819' 
  AND token = 'KYP7AoRolqsYq1ur8YDJozx21hKISxjKbu4WOujJ/eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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