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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5762a541179a9e2238f3a29b1f9a1b4d783c1642878d772591c03a444cb74c07' 
  AND token = 'xdUn/3z2EE4GEiYqs7w6ZsBHcIT1IYL9UTdsw46mOnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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