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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbe7fb9360159612b36db17664fcbc05dd0361c6e02759117d411169f6f9eb5' 
  AND token = '5P8ln1DmwfqmEMgCVYiXHPSNrx9Bc/AGf8wosCPGbT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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