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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196c4c5519e3cacbb395dd861faeed5c94e57322fe135c3ef15c44c515bf875a' 
  AND token = 'uI7bnZYdTsO1UOQQCKrvbXu5urKUEXyVz3SwxsQ1kcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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