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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d2bfedf5999f2588aa1c0764e7db449c68fa05b0f81df6bde9bb29504a049c' 
  AND token = 'QlorLmL9i2V0k2t8O/RwqIc6pF6u/T4a91W1taiKAc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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