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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5f84771bea38b083e8d0c5bd0472f8dd0f86a997eceddb0e34ab3bc89638d8' 
  AND token = 'TXkeXiMR3W4JBAe8tF631+fdNnwMcL+3o5NDUpkw1K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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