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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94be1c21f2f4a0371984e475b2733cc7ae88cc349ce7b8ee071df8097ba5c9ec' 
  AND token = 'nGrAJvDCCCrGGMoaLT2Qw/aIWWnfM9dnayh/rkv8GIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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