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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeec411c64fc2349558e5ee08554d5e188eb67bc3af98565745b0f259aa1e056' 
  AND token = 'd0A/FnLN8x/uPc7Xo6wsksN9C3OgY18b32ha+fttzA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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