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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ac4e4d64b036f6cd803d47230abb7d191afb726664a362257617cf60103c03' 
  AND token = 'oilgv+7tAnFQfdVifw00/b5LVq6+X8i0JHSFJT1N5vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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