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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c067386dd1a80fe8eba07f4a990dbcef3143fcb3f6b759ff68d23b111ecd91' 
  AND token = '0abSYB8xY4PW4kb/vcIQNhtcuXZYh3drod653aPPtq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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