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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32433e0ce369b6b0dc9019054eda413e718445c957841cae29ca4bb0e5779f90' 
  AND token = 'vA88L+dr1i8m/ZkW99IurZ8xet6nF6HkwJzgkttP4IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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